JPH0856256A - Telephone set - Google Patents

Abstract

PURPOSE:To accurately detect hook-on of an opposite party and to surely attain automatic hook-on while transmitting a mischief phone call attack signal to the opposite party in the line closing state. CONSTITUTION:While a hook switch circuit 8 closes a line, when a mischief phone call attack button is depressed, a control microcomputer 24 closes an analog switch 19 and controls a voice synthesis circuit 18 to synthesize unpleasant voice signals, which are sent to the line via a speech network circuit 10. The control microcomputer 24 opens the analog switch 19 periodically to interrupt the transmission of the unpleasant voice signal. While the transmission of the unpleasant voice signal is interrupted, when a BT signal detection circuit 23 detects a BT signal, the control microcomputer 24 stops the voice synthesis by the voice synthesis circuit 18 to control the hook switch circuit 8 thereby opening the line and setting the telephone set to the standby state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone, and more particularly to a telephone capable of generating a predetermined signal for repelling mischief, holding, etc. under a line-closed state and sending the signal to the other party through a line.

[0002]

2. Description of the Related Art When a prank call is made to a telephone, a prank call is sent to the other party as a prank call repulsion signal, or a voice of the other party is recorded and replayed and sent back. Some are equipped with functions. Also, most telephones have a hold function that sends out a hold melody signal in order to call another person or to have the other party wait a little for the investigation.

[0003]

In the case of the mischief telephone repulsion function, the mischief telephone repulsion function is activated because the repulsion effect cannot be expected unless the prank call repulsion signal is continuously sent to the other party for a certain time or longer. It is not possible to put the handset on the telephone body immediately afterwards and operate it on-hook. However, if you use the on-hook operation after confirming that the other party hangs up, you will hear the other party's voice. Therefore, it is possible to continue sending the prank call repulsion signal in the on-hook call, but even if the other party hangs up the line and the line open signal indicating that the line is opened from the exchange is sent, the prank will continue from here. Since the telephone repulsion signal is being sent continuously, the line open signal cannot be detected, and it cannot automatically go on-hook and enter the standby state. Therefore, even if the prank call hangs up, other people can't connect.
When the hold function is turned on, the handset is usually returned to the telephone body, but in this case, the other party who has been waiting for a long time may hang up. Even at this time, since the hold melody signal is continuously output, the line open signal cannot be detected even if the other party hangs up the phone midway, and the on-hook state cannot be automatically set to the standby state. Therefore, even if another person calls, it does not work.

A line open signal indicating that the other party has released the line is a signal that the other party of the NTT telephone line hangs up when the exchange of the central office detects that one of the parties is hanging up. A predetermined signal tone that the switch sends to the other telephone to indicate that it has been hung up and that the handset should be placed. This signal tone is a signal tone emitted when only one of the telephones connected by the telephone line is picking up the so-called busy tone (busy tone = Busy tone).
Tone (hereinafter referred to as BT signal)). In the following description, a line open signal indicating that the other party has opened the line may be referred to as a BT signal.

The present invention has been made in view of the above problems of the prior art.
An object of the present invention is to provide a telephone that can accurately detect when the other party hangs up the telephone while generating a predetermined signal in a line-closed state and transmitting the signal to the other party and surely perform automatic on-hook.

[0006]

According to one aspect of the present invention, in a telephone capable of generating a predetermined signal under a line closed state and transmitting the predetermined signal to the other party through a line, when the predetermined signal is transmitted,
Interrupting means for periodically interrupting signal transmission, line opening signal detecting means for detecting whether or not a line opening signal indicating that the other party has opened the line has been sent, and the receiver is on-hook while the predetermined signal is being sent. The circuit is not opened even when turned on, and the control means is provided to open the line and put it in a standby state when the line open signal detection means detects the line open signal while the transmission of the predetermined signal is interrupted. It is characterized by that.

Another aspect of the present invention is characterized in that the interruption means interrupts the signal transmission by lowering the transmission level of the predetermined signal to a predetermined constant value.

According to another aspect of the present invention, the control means controls the line even when a predetermined fixed time has elapsed since the first transmission of the predetermined signal was started without the line open signal detecting means detecting the line open signal. The feature is that it is opened and put into a standby state.

According to another aspect of the present invention, the control means opens the line even when the interrupting means repeats interrupting the transmission of the predetermined signal a predetermined number of times without detecting the line open signal by the line open signal detecting means. It is characterized by being in a standby state.

[0010]

According to one aspect of the present invention, the transmission of the predetermined signal is periodically interrupted to detect whether the line open signal is on the line. The line is not opened even if the handset is turned on-hook while the predetermined signal is being sent, and the line is opened and put into a standby state when the line open signal is detected while the sending of the predetermined signal is suspended. . With this, when detecting a line open signal, it is possible to prevent certain signals such as prank repulsion, hold and so on from being mixed with the line open signal, so you can listen and check if the other party has already hung up, and manually Even if the on-hook operation is not performed, it is possible to accurately detect that the other party hangs up the phone and reliably perform automatic on-hook.
Therefore, after that, it is possible to accept a call made by another person.

According to another aspect of the present invention, the interrupting means interrupts the signal transmission by lowering the transmission level of the predetermined signal to a predetermined constant value. As a result, it is possible to continue sending the predetermined signal to the other party while suppressing the level so as not to affect the detection of the line open signal even during the interruption of the predetermined signal.

According to still another aspect of the present invention, the line is opened and put in a standby state even when a predetermined time has elapsed since the first transmission of the predetermined signal was started without detecting the line open signal. As a result, even if the other party does not easily hang up, it is possible to automatically accept on-hook and then accept a call made by another person.

According to another aspect of the present invention, the line is opened and put in a standby state even when the transmission of the predetermined signal is interrupted a predetermined number of times without detecting the line open signal. As a result, even if the other party does not easily hang up, it is possible to automatically accept on-hook and then accept a call made by another person.

[0014]

1 is a circuit diagram of a telephone according to an embodiment of the present invention. Reference numeral 1 denotes a receiver, which includes a transmitting microphone 2 and a receiving speaker 3. 4 is the telephone body, of which,
5 is a terminal connected to a public telephone line (L1, L2), 6
Is a ringer circuit that makes a ringing tone when a call comes in. 7 is a polarity matching circuit that connects the inside of the telephone main body and the public telephone line and makes the same polarity inside the telephone main body regardless of the polarity switching of the public telephone line, Reference numeral 8 denotes a hook switch circuit for electrically performing on-hook / off-hook, which is controlled by a control microcomputer described later. Reference numeral 9 is a balance network circuit for extracting a reception voice signal and a side conversation voice signal from the line signal, and 10 is a voice signal input from the transmission microphone 2 of the receiver 1 to the line side or a voice input from the balance network circuit 9. A speech network circuit that outputs a signal to the receiving speaker 3 of the handset 1, 11 is a preamplifier that amplifies the audio signal input from the balance network circuit 9 to a predetermined level, 12 is an analog switch that is controlled to open and close by a control microcomputer, and 13 is Analog switch 12
A power amplifier that amplifies the power of the audio signal input via the reference numeral 14 is a loud speaker driven by the power amplifier 13.

Reference numeral 15 is a cassette tape, and 16 is a tape recording / reproducing for recording the audio signal input from the balance network circuit 9 on the cassette tape 15 under the control of the control microcomputer or reproducing and outputting the recording signal of the cassette tape 15. A circuit, 17 is an analog switch whose opening and closing is controlled by a control microcomputer, 18 is a voice synthesizing circuit for synthesizing and outputting a voice signal such as an unpleasant sound or a threatening voice for repelling mischief or a hold melody sound according to the control of the control microcomputer An analog switch controlled to be opened and closed by the control microcomputer, 20 is an adder for adding the voice signals output from the analog switches 17 and 19 and the dial tone signal output by the control microcomputer, and the output side is connected to the speech network circuit 10. To have.

Reference numeral 21 is a switch that opens when the handset 1 is placed on the telephone body 2 and closes when the telephone body 2 is lifted, and 22 is a key matrix, such as a dial button, an on-hook button, a prank repulsion button, and a hold button. I have it. 23 is B from the output of the preamplifier 11.
A BT signal detection circuit that detects a T signal and outputs a BT signal detection signal to the control microcomputer. 24 is a control microcomputer for performing mischievous repulsion operation, hold operation, automatic on-hook operation, etc. in addition to normal call operation. Various controls of.

Next, the operation of this embodiment will be described with reference to FIGS. 2 and 3 are flowcharts showing the control processing of the control microcomputer 24. Prank repelling operation When the standby state is in advance, the control microcomputer 24 keeps the analog switches 12, 17 and 19 open. When the telephone is called, the ringer circuit 6 makes a ringing tone. Picking up the handset 1 closes the switch 21,
The control microcomputer 24 senses the closing of the switch 21 and controls the hook switch circuit 8 to close the line and put it in an off-hook state, thereby enabling a call (step 10 in FIG. 2).
1, 102). The other party's voice is heard from the receiving speaker 3 of the handset 1 via the balance network circuit 9 and the speech network circuit 10. Also, one's own voice is sent to the line via the transmitting microphone 2 and the speech network 10, and returns to the receiving speaker 3 via the balance network 9 and the speech network 10 and is heard at an appropriate volume.

When it is a mischievous telephone and it is desired to repel it, the mischievous repelling button of the key matrix 22 is pressed and then the handset 1 is returned to the top of the telephone body 2. At this time, the switch 21 is opened, but the line closed state by the hook switch circuit 8 is maintained. When the prank repulsion button is pressed, the control microcomputer 24 first controls the tape recording / reproducing circuit 16 to record the received voice signal on the cassette tape 15 for a predetermined time T _{1 and} then rewind it to the recording start position (step 103-). 105). Then, the analog switches 17 and 19 are closed and the tape recording / reproducing circuit 16 is controlled to reproduce the cassette tape 15 (steps 106 and 1).
07). Further, the voice synthesizing circuit 18 is controlled to synthesize and output the unpleasant sound or the threatening voice for repelling the mischief (step 108). A voice signal in which the voice of the other party reproduced from the cassette tape 15 and the unpleasant sound or the threatening voice output from the voice synthesizing circuit 18 are combined is continuously transmitted to the line through the speech network circuit 10 as a prank repulsion signal. It

Thereafter, the control microcomputer 24 determines whether the transmission of the mischievous repulsion signal this time has continued for a predetermined time T ₁ (step 109) or a predetermined constant time T ₂ (T ₂ Is longer than T _{1 and} is a predetermined fixed time required to exert the effect of repelling mischief), and it is checked (step 110). When the result in step 109 is YES, the control microcomputer 24 opens the analog switches 17 and 19 to temporarily suspend the transmission of the prank repulsion signal (step 111). Then, it is checked whether or not the BT signal is detected from the output of the BT signal detection circuit 23 (step 112). When the BT signal detection signal is output, the control microcomputer 24 determines YES in step 112, controls the tape recording / reproducing circuit 16 to rewind it to the recording start position and stop it, and the voice synthesizing circuit 18 synthesizes the voice. Stop the analog switch 17, 19
To stop the prank repulsion action (step 11
3). Then, automatic on-hook processing is performed, the hook switch circuit 8 is controlled to open the line, and the telephone is put in a standby state (step 114).

If the other party hangs up the telephone, B is sent from the exchange.
Although the T signal is sent, the BT signal detection circuit 23 can accurately detect the BT signal while the transmission of the prank repulsion signal is interrupted, and the control microcomputer 24 outputs the B signal.
It is possible to reliably execute the automatic on-hook processing based on the T signal. Therefore, after that, it becomes possible to accept a call made by another person.

If the BT signal is not detected in step 112, the control microcomputer 24 suspends the transmission of the mischievous repulsion signal n times (n is 2 or more to minimize the mischievous repulsion effect). It is checked whether it has been repeated a predetermined number of times (step 115) and N
If it is O, the process returns to step 105, and the prank repulsion signal is continuously transmitted again. After that, if the answer is YES in step 112 because the other party hung up, the prank repulsion operation is stopped, and then the automatic on-hook processing is performed.
The hook switch circuit 8 is controlled to open the line and return the telephone to the standby state. When the other party does not hang up, when the time T ₂ sufficient for repulsing the mischief has elapsed from the start of sending the prank repulsion signal for the first time, or when the prank repulsion signal transmission interruption operation has been repeated n times (YES in step 110 or 115), the mischievous repulsion operation is stopped, and then the automatic on-hook processing is performed. As a result, even if the other party does not easily hang up, it is possible to automatically go on-hook and then accept a call made by another person.

It should be noted that when a telephone call is made and the on-hook button of the key matrix 22 is pressed instead of picking up the handset 1, the control microcomputer 24 controls the hook switch circuit 8 to close the line and the analog switch 12 is connected. Close the speaker and listen to the loudspeaker 1
4 (step 116, steps 201 and 202 in FIG. 3; on-hook call). Because of the prank call, when the prank repulsion button is pressed (YES in step 203), the control microcomputer 24 executes the processing after step 104 in FIG. 2 described above to repel the prank.

[0023] When a telephone call is made in the hold operation standby state, when the user picks up the handset 1 to make a call and the other party's request is another person, it is necessary to have the other party wait while the call is made. Press the hold button to return the handset 1 to the top of the telephone body 2. At this time, the switch 21 is opened, but the line closed state by the hook switch circuit 8 is maintained. When the hold button is pressed, the control microcomputer 24 senses this, closes the analog switch 19, controls the voice synthesizing circuit 18 to voice-synthesize and output the hold melody signal, and outputs it to the line via the speech network circuit 10. It is continuously sent (steps 204 to 206).

After that, the control microcomputer 24 checks whether or not the transmission of the hold melody signal this time has continued for a predetermined time T ₁ (step 207), and if not, continues the transmission of the hold melody signal. YE in step 207
When it becomes S, the control microcomputer 24 opens the analog switch 19 to temporarily interrupt the transmission of the hold melody signal (step 208), and the BT signal detection circuit 23.
It is checked whether or not the BT signal is detected from the output of (step 209). When the BT signal detection signal is output, the control microcomputer 24 proceeds to step 209.
If YES, the voice synthesizing operation of the voice synthesizing circuit 18 is stopped and the analog switch 19 is opened to stop the holding operation (step 210). Subsequently, automatic on-hook processing is performed, the hook switch circuit 8 is controlled to open the line, and the telephone is put into a standby state (step 211).

The BT signal is sent from the exchange if the other party who has been waiting for a call hangs up, but the BT signal detection circuit 23 can accurately detect the BT signal while the sending of the hold melody signal is interrupted. Therefore, the control microcomputer 24 can surely execute the automatic on-hook processing based on the BT signal. Therefore, after that, it becomes possible to accept a call made by another person.

If no BT signal is detected in step 209, the control microcomputer 24 proceeds to step 2
Returning to 05, the hold melody signal is continuously transmitted again. After that, the other party hung up and the step 2
If YES in 09, the hold operation is stopped and then the automatic on-hook processing is performed. When the person who receives the call takes up the handset 1 before the other party hangs up the telephone, the switch 21 is closed. Upon detecting this, the control microcomputer 24 stops the voice synthesizing operation and opens the analog switch 19 to stop the holding operation, and enables the telephone call by the handset 1 (steps 212 and 213). When the handset 1 is returned to the top of the telephone body 2 after the call is finished, the switch 21 is opened, and the control microcomputer 24 which detects this opens the line by opening the line by controlling the hook switch circuit 8 (step). 214, 215).

When a telephone call is made and the on-hook button of the key matrix 22 is pressed instead of picking up the handset 1, the control microcomputer 24 controls the hook switch circuit 8 to close the line and the analog switch 12 to be turned on. Closed and received voice is loud speaker 14
(Step 116 in FIG. 2, FIG. 3)
Steps 201, 202 of. On-hook call). If you want to talk with the other party, pick up the handset 1 and switch 21
Is closed, and the control microcomputer 24 that senses this opens the analog switch 12 to release the on-hook call state, and enables the call by the handset 1 (step 21).
6, 217). When the on-hook button is pressed in the on-hook call state, the control microcomputer 24 opens the analog switch 12 to release the on-hook call state, controls the hook switch circuit 8 to open the line, opens the analog switch 12, and waits for the telephone. (Steps 218 to 220).

According to this embodiment, when the line open signal is detected, the transmission of the predetermined signal for repelling the mischief and the hold signal is interrupted so as not to be mixed with the line open signal, so that the other party hangs up the call. It is possible to accurately detect when the other party hangs up by phone without hearing the on-hook operation manually, and to reliably perform automatic on-hook. Therefore, after that, it is possible to accept a call made by another person. In addition, when a certain fixed time has elapsed after the first transmission of the predetermined signal for repelling mischief and hold without starting the line open signal was detected, or when the transmission of the predetermined signal was interrupted without detecting the line open signal. When is repeated a predetermined number of times, the line is released and put in a standby state, so that even if the other party does not easily hang up, it is possible to automatically go on-hook and then accept the calls made by other people.

The BT signal is a 400 Hz AF signal, as defined in Article 33 of the Telecommunications Equipment Regulations for Business.
The signal is intermittent at 0.5 second intervals, and the transmission level to the line is (-29-L) dBm or more and -4 dBm or less (L
Is the transmission loss at 400 Hz on the subscriber line. According to the reference value announced by NTT, the maximum is 7 dB or less).
Therefore, in order to ensure that the BT signal detection circuit 23 can detect that it is a BT signal, the time during which the transmission of the predetermined signal for repelling mischief, holding, etc. is interrupted is 2-3.
It is preferable to set the time to be an appropriate time of seconds or more. Also, the time from the interruption of the predetermined signal to the next interruption can be changed appropriately according to the purpose, such as shortening it in the case of repelling mischief and lengthening it in the case of holding it off,
Furthermore, if the time from the start of the first transmission of the predetermined signal to the first interruption is lengthened to some extent, the function of the predetermined signal can be sufficiently exhibited, which is convenient.

In the above embodiment, the voice of the opponent is recorded on the cassette tape 15 in order to repel the mischief,
Although this is played back and sent back, the voice of the other party may be digitally recorded in the semiconductor memory, and this may be played back and sent back. Further, instead of synthesizing and outputting the unpleasant sound and the threatening sound for repelling the mischief in the voice synthesizing circuit 18, the control microcomputer 24 may generate a beep sound signal and output it to the adder 20. In this case, the control microcomputer 24 does not provide any special switch means for interrupting the transmission of the predetermined signal, and the control microcomputer 24 periodically forms a silent portion or a low signal level portion in the beep sound signal. It is also possible to serve as a means for interrupting the predetermined signal. It should be noted that there is no particular problem with the interrupting means even if you interrupt the prank repulsion signal all at once, but in the case of the hold signal, sudden interruption will cause discomfort to the other party, so gradually reduce the signal level and soften it. It may be interrupted, or as a means for lowering the level, it does not affect the detection of the BT signal without completely interrupting the transmission of the hold signal, but it is possible to listen to the hold sound at a low level (about -40 dBm). For example, the BT signal is hardly affected, but it functions sufficiently as a hold sound).

[0031]

According to one aspect of the present invention, the sending of a predetermined signal is periodically interrupted to detect whether a line open signal is on the line, and the handset is put on-hook while the predetermined signal is being sent. Even if the line open signal is detected and the line open signal is detected while the transmission of the predetermined signal is interrupted, the line is opened and put in the standby state. Since it is possible to prevent certain signals for repulsion, hold, etc. from being mixed with the line release signal, you can listen to the other party to check if the other party has already hung up the phone, and the other party can answer the call without manually performing on-hook operation. It is possible to accurately detect the cut and surely perform automatic on-hook.
Therefore, after that, it is possible to accept a call made by another person.

According to another aspect of the present invention, the interrupting means interrupts the signal transmission by lowering the transmission level of the predetermined signal to a predetermined constant value. It is possible to continue sending the predetermined signal to the other party while suppressing the level so as not to affect the detection of the open signal.

According to still another aspect of the present invention, the line is opened and put into a standby state even when a predetermined fixed time has elapsed after the first transmission of the predetermined signal was started without detecting the line open signal. Therefore, even if the other party does not easily hang up, the call can be automatically received on-hook and then the call made by another person can be accepted.

According to another aspect of the present invention, the line is opened and put in the standby state even when the transmission of the predetermined signal is interrupted for a predetermined number of times without detecting the line open signal. Even if it is difficult to hang up the call, it can automatically go on-hook and then accept calls made by other people.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a telephone according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of a control microcomputer.

FIG. 3 is a flowchart showing an operation of a control microcomputer.

[Explanation of symbols]

1 Handset 4 Telephone main body 8 Hook switch circuit 9 Balance network circuit 10 Speech network circuit 15 Cassette tape 16 Tape recording / playback circuit 17, 19 Analog switch 18 Voice synthesis circuit 21 Switch 22 Key matrix 23 BT signal detection circuit 24 Control microcomputer

Claims (4)

[Claims] 1. A telephone capable of generating a predetermined signal in a line-closed state and transmitting the predetermined signal to the other party through the line, and an interruption means for periodically interrupting the signal transmission when the predetermined signal is transmitted, and the other party disconnects the line. A line open signal detecting means for detecting whether or not a line open signal indicating that the line has been opened is sent, and the line is not opened even if the receiver is on-hook while the predetermined signal is being sent, and the predetermined signal is sent. A telephone comprising: a control means for opening the line to put it in a standby state when a line open signal is detected by the line open signal detecting means during the interruption. 2. The telephone according to claim 1, wherein the interruption means interrupts the signal transmission by lowering the transmission level of the predetermined signal to a predetermined constant value. 3. The control means opens the line and puts it in a standby state even when a predetermined fixed time has elapsed after the first transmission of the predetermined signal was started without the line open signal being detected by the line open signal detecting means. The telephone set according to claim 1 or 2, characterized in that 4. The control means is configured to open the line and put it in a standby state even when the interrupting means repeats interrupting the transmission of the predetermined signal a predetermined number of times without detecting the line open signal by the line open signal detecting means. The telephone according to claim 1 or 2, characterized in that.